I turn on the ignition switch so that the control lamps come on. I press the AS button, then while holding it, I turn on the radio and keep holding AS to be able to enter the code. Unfortunately, even despite holding this button for a long time, the text error is still displayed. (Opel Corsa C 2001. Radio Grundig 2002). What to do to enter the code. Unfortunately, I have no instructions from the radio.
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